Some 48 per cent of Brits aged 16-24 and 47 per cent of those aged 25-34 have experienced a seasonal allergy such as hayfever in the past year, compared to just 25 per cent aged 55 and over, according to new figures from Mintel.

Mintel suggests that the difference may be down to the development of a new allergy or greater awareness of an existing allergy in young adults, whereas older adults may have learnt to avoid certain triggers.

Lucy Cornford, head of Mintel beauty and personal care, said: “Climate change looks to be increasing instances of seasonal allergies in the UK, with warmer weather causing trees and grasses to flower early, releasing more pollen and elongating the hayfever season.”

The research also revealed that 26 per cent of sufferers do not treat symptoms, highlighting the potential for pharmacy staff to step in with product recommendations and advice.